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Earnings Per Share - Schedule of Computation of the Income (Loss) and Share Data Used in the Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic earnings (loss) per share- |  |  |
Net income (loss) | $ 369,658 | $ 325,928 | $ (240,634)
Weighted-average shares outstanding | 42,111 | 42,036 | 43,716
Non-vested dividend participating awards | 308 | 322 | 145
Weighted-average shares outstanding used for basic earnings per share | 42,419 | 42,358 | 43,861
Basic earnings (loss) per share from continuing operations | $ 8.71 | $ 7.69 | $ (5.49)
Diluted earnings (loss) per share- |  |  |
Net income (loss) | $ 369,658 | $ 325,928 | $ (240,634)
Weighted-average shares outstanding used for basic earnings per share | 42,419 | 42,358 | 43,861
Share options on issue |  | 5 | 8
Adjusted weighted average number of ordinary shares outstanding, Total | 42,419 | 42,363 | 43,869
Diluted earnings (loss) per share from continuing operations | $ 8.71 | $ 7.69 | $ (5.49)

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